Burner for liquid fuel.



H. E. YARROW.

BURNER FOB LIQUID FUEL.

APPLICATION FILED SEPT. 27, 1913.

1 1 14,664. Patented Oct. 20, 1914.

- Q UNITED STATES rarnnron HAROLD EDGAR YARROW, or GLASGOW, SCOTLAND.

BURNER non LIQUID FUEL.

Specification of Letters Patent.

Patented Oct. 20, 1914;,

Application filed September 27, 1913. Serial No. 792,19

To all whom it may concern Be it known that I,-HAR0LD EDGAR YAR- now, asubject of the King of Great Britain, residing in Sootstoun, Glasgow,Scotland, and whose post-office address is Yarrow &

Co. Ltd, Scotstoun, Glasgow, Scotland, have invented certain new anduseful Improvements in Burners for Liquid Fuel, of which the followmg 1sa specification.

This invention relates to burners for liquid fuel, such for example asare usedin oil-fired boiler furnaces, and has for its object to providemeans whereby the angle of the cone of spray or atomized fuel delivered;by the burner nozzle can be kept constant for I vention is shown inlongitudinal section in Figure 1 of the accompanying drawings, Fig. 2being a corresponding vlew ofa modified apparatus, whlle Figs. 1 and 2are corresponding views of detail features of Figs.-

1 and 2 respectively.

In both of these constructions, which it is to be understood are givenmerely in illustration of the invention, the whirl velocity of the oilor other liquid fuel is varied by varying the width of a spiral ductthrough which the oil (preferably heated) is forced under pressure, theduct being formed by the coils of a helical spring which encircles theend of the regulating spindle whereby the rate of fuel consumption iscontrolled.

In the construction of Fig. 1, the helical spring A encircles the outerend of the regulating spindle C so as to slide freely thereon and iscompressed between a tubular spindle D and a tubular abutment or seatingB which also forms thewall of the whirl chamber leading to the dischargeaperture S in the nozzle plate F. This plate has a rearwardly extendingcylinder within which the seating B and the helical spring A fit snuglyand which is itself encircled, by the forward end of a hollow casting orshell G which internally at its rear end'to receive an externallyscrewthreaded portion of the tubular spindle D, the rear end of which isalso screwthreaded internally at P to; receive a screwthreaded portionof the regulating spindle G. The rear; ends of the spindles ,G,

i of the helical spring A and is screwthreaded i D are each fitted witha hand-wheel or lever indicated at R, Q, respectively wherebythe conedend of there-gulating spindle maybeadvanced ,toward or withdrawn fromthe nozzle aperture S,and,the helical spring A may have its spirescompressedor releasedto vary thecross sectional area ofthe spiral ductM, which imparts a gyratory or whirling motion' to the oil which isdelivered under, pressure to'inletgNy in the casing K and passes thencethrough holesL in the inner casing or shell Ginto' the chamber E.The'shell G is flanged atits forward end to abut against the end of theouter casing K and, together with the nozzle plate F; is secured bymeans of thecap screwedon the end of the casing'Ku The cap H andplates Fare coned to the same angle which as shown is preferablyv somewhatgreater than I that of the cone of atomized fuel which issues from theburner. To prevent leakage of'oil along the surface of the spindleC,thelat ter is preferably grooved circumferentially at intervals. alongits length asindicated 'When the regulating spindle G is advanced so asto close the aperture S more or, less, the tubular spindle D is rotatedso as to compress the spring A and reduce the whirling velocity of theoil to such an extent that the angle of the spray cone will remainconstant. Similarly, when the regulating I spindle G is withdrawnfarther from the aperture S, the tubular spindle D is unscrewed so as toincrease the sectional area of the spiral duct M sufficiently tomaintain the angle of the spray cone constant.

In the construction shown in Fig. 2 corresponding parts havebeendesignated by the reference characters applied to those parts in Fig.1,'and the essential difference between the two constructions is thatwhereas in the former the two independently adjustable spindles wereprovided for controlling the rate of consumption and the whirl velocityof the fuel, both are simultaneously controlled in the construction ofFig. 2 by a single regulating spindle G which has a collar W near itsforward end forming the rear abutment of the helical spring A.

The relation of the aperture S, the coned end X of the regulatingspindle, the collar W thereon and the rear edge of the cylindricalsleeve F which extends rearwardly from the aperture plate F, is suchthat when the aperture S is on the point of being closed by the cone Xthe collar WV abuts against the sleeve F, so that the spindle C may bescrewed hard up by the handle R without damaging the edge of theaperture S.

It will be seen that with this construction as the coned end X of theregulating spindle is Withdrawn from the aperture S, the helical springA is simultaneously enabled toextend, thereby increasing the width ofthe spiral duct M and consequently the whirl velocity ofthe' oil.Conversely, when the regulating spindle is screwedtoward the aperture S;the Width of the spiral duct M is: simultaneously and correspondinglydecreased. I

The rate of change of consumption of fuel and the rate of whirl velocityare so arranged that a constant or substantiallyconstant angle ofspraying cone will be maintained for all positions of the regulatingspindle.

'I- claim j 1. In a liquid fuel burner, the combination of a fueloutlet, a whirl chamber behind said outlet, a regulating spindleprojecting into said whirl chamber and a helical spring encircling saidregulating'spindle and forming a spiral duct through which the fuel isled to the Whirl chamber.

2. In a liquid fuel burner, the combination of a fuel outlet, a whirlchamber behind said outlet, a regulating spindle projecting into saidwhirl chamber, a helical spring encircling said regulating spindle andforming a spiral duct through which the fuel is led to the Whirl chamberand means for compressing said helical spring to vary the crosssectional area of the spaces between its several volutes.

3. In a liquid fuel burner, the combination of a fuel outlet, a whirlchamber behind said outlet, a regulating spindle projecting into saidwhirl chamber, a helical spring encircling said regulating spindle andforming aspiral duct through which the fuel is led to the whirl chamberand means operated by the regulating spindle to vary the cross sectionalarea of the spaces between the several volutes of said helical spring.

4. In a liquid fuel burner, the combination of a fuel outlet, a whirlchamber behind said outlet, a regulating spindle projecting intosaidwhirl chamber, a helical spring encircling said regulating spindle andforming' a spiral duct through which the fuel is led to the whirlchamber and means for compressing said helical spring to vary the crosssectional area of the spaces between its several volutes comprising acollar upon the regulating spindle.-

, In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

HAROLD EDGAR YARROW.

WVitnesses:

DANIEL McIN'rYRE, LEROY W'EBER.

Copies of this patent may be obtained for hire cents each, by addressingthe Commissioner of Patents.

' Washington, D. c."

